3M 8511 N95 Particulate Respirator with Breather Valve 3M Cool Flow Exhalation Valve reduces heat build-up inside the respirator NIOSH approved for at least 95 percent filtration efficiency against certain non-oil based particles Adjustable M-noseclip reduces potential for eyewear fogging Braided headbands two-strap design with dual point attachment helps provide a secure seal Advanced Electret Media is designed for ease of breathing